Input: stmpe - enforce device tree only mode

The STMPE keypad controller is only used with device tree configured
systems, so force the configuration to come from device tree only, and now
actually get the rows and cols from the device tree too.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

4 files changed, 48 insertions, 79 deletions

diff --git a/Documentation/devicetree/bindings/input/stmpe-keypad.txt b/Documentation/devicetree/bindings/input/stmpe-keypad.txt
index 1b97222e8a0b..12bb771d66d4 100644
--- a/Documentation/devicetree/bindings/input/stmpe-keypad.txt
+++ b/Documentation/devicetree/bindings/input/stmpe-keypad.txt
@@ -8,6 +8,8 @@ Optional properties:
  - debounce-interval        : Debouncing interval time in milliseconds
  - st,scan-count            : Scanning cycles elapsed before key data is updated
  - st,no-autorepeat         : If specified device will not autorepeat
+ - keypad,num-rows          : See ./matrix-keymap.txt
+ - keypad,num-columns       : See ./matrix-keymap.txt
 
 Example:
 
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 96ee26c555e0..a5d9b3f3c871 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -559,6 +559,7 @@ config KEYBOARD_SH_KEYSC
 config KEYBOARD_STMPE
         tristate "STMPE keypad support"
         depends on MFD_STMPE
+        depends on OF
         select INPUT_MATRIXKMAP
         help
           Say Y here if you want to use the keypad controller on STMPE I/O
diff --git a/drivers/input/keyboard/stmpe-keypad.c b/drivers/input/keyboard/stmpe-keypad.c
index c6727dda68f2..8d1e7af3c5b1 100644
--- a/drivers/input/keyboard/stmpe-keypad.c
+++ b/drivers/input/keyboard/stmpe-keypad.c
@@ -45,7 +45,7 @@
 #define STMPE_KEYPAD_MAX_ROWS           8
 #define STMPE_KEYPAD_MAX_COLS           8
 #define STMPE_KEYPAD_ROW_SHIFT          3
-#define STMPE_KEYPAD_KEYMAP_SIZE        \
+#define STMPE_KEYPAD_KEYMAP_MAX_SIZE \
         (STMPE_KEYPAD_MAX_ROWS * STMPE_KEYPAD_MAX_COLS)
 
 /**
@@ -99,16 +99,30 @@ static const struct stmpe_keypad_variant stmpe_keypad_variants[] = {
         },
 };
 
+/**
+ * struct stmpe_keypad - STMPE keypad state container
+ * @stmpe: pointer to parent STMPE device
+ * @input: spawned input device
+ * @variant: STMPE variant
+ * @debounce_ms: debounce interval, in ms.  Maximum is
+ *               %STMPE_KEYPAD_MAX_DEBOUNCE.
+ * @scan_count: number of key scanning cycles to confirm key data.
+ *              Maximum is %STMPE_KEYPAD_MAX_SCAN_COUNT.
+ * @no_autorepeat: disable key autorepeat
+ * @rows: bitmask for the rows
+ * @cols: bitmask for the columns
+ * @keymap: the keymap
+ */
 struct stmpe_keypad {
         struct stmpe *stmpe;
         struct input_dev *input;
         const struct stmpe_keypad_variant *variant;
-        const struct stmpe_keypad_platform_data *plat;
-
+        unsigned int debounce_ms;
+        unsigned int scan_count;
+        bool no_autorepeat;
         unsigned int rows;
         unsigned int cols;
-
-        unsigned short keymap[STMPE_KEYPAD_KEYMAP_SIZE];
+        unsigned short keymap[STMPE_KEYPAD_KEYMAP_MAX_SIZE];
 };
 
 static int stmpe_keypad_read_data(struct stmpe_keypad *keypad, u8 *data)
@@ -208,15 +222,14 @@ static int stmpe_keypad_altfunc_init(struct stmpe_keypad *keypad)
 
 static int stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
 {
-        const struct stmpe_keypad_platform_data *plat = keypad->plat;
         const struct stmpe_keypad_variant *variant = keypad->variant;
         struct stmpe *stmpe = keypad->stmpe;
         int ret;
 
-        if (plat->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
+        if (keypad->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
                 return -EINVAL;
 
-        if (plat->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT)
+        if (keypad->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT)
                 return -EINVAL;
 
         ret = stmpe_enable(stmpe, STMPE_BLOCK_KEYPAD);
@@ -245,7 +258,7 @@ static int stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
 
         ret = stmpe_set_bits(stmpe, STMPE_KPC_CTRL_MSB,
                              STMPE_KPC_CTRL_MSB_SCAN_COUNT,
-                             plat->scan_count << 4);
+                             keypad->scan_count << 4);
         if (ret < 0)
                 return ret;
 
@@ -253,17 +266,18 @@ static int stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
                               STMPE_KPC_CTRL_LSB_SCAN |
                               STMPE_KPC_CTRL_LSB_DEBOUNCE,
                               STMPE_KPC_CTRL_LSB_SCAN |
-                              (plat->debounce_ms << 1));
+                              (keypad->debounce_ms << 1));
 }
 
-static void stmpe_keypad_fill_used_pins(struct stmpe_keypad *keypad)
+static void stmpe_keypad_fill_used_pins(struct stmpe_keypad *keypad,
+                                        u32 used_rows, u32 used_cols)
 {
         int row, col;
 
-        for (row = 0; row < STMPE_KEYPAD_MAX_ROWS; row++) {
-                for (col = 0; col < STMPE_KEYPAD_MAX_COLS; col++) {
+        for (row = 0; row < used_rows; row++) {
+                for (col = 0; col < used_cols; col++) {
                         int code = MATRIX_SCAN_CODE(row, col,
-                                                STMPE_KEYPAD_ROW_SHIFT);
+                                                    STMPE_KEYPAD_ROW_SHIFT);
                         if (keypad->keymap[code] != KEY_RESERVED) {
                                 keypad->rows |= 1 << row;
                                 keypad->cols |= 1 << col;
@@ -272,51 +286,17 @@ static void stmpe_keypad_fill_used_pins(struct stmpe_keypad *keypad)
         }
 }
 
-#ifdef CONFIG_OF
-static const struct stmpe_keypad_platform_data *
-stmpe_keypad_of_probe(struct device *dev)
-{
-        struct device_node *np = dev->of_node;
-        struct stmpe_keypad_platform_data *plat;
-
-        if (!np)
-                return ERR_PTR(-ENODEV);
-
-        plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
-        if (!plat)
-                return ERR_PTR(-ENOMEM);
-
-        of_property_read_u32(np, "debounce-interval", &plat->debounce_ms);
-        of_property_read_u32(np, "st,scan-count", &plat->scan_count);
-
-        plat->no_autorepeat = of_property_read_bool(np, "st,no-autorepeat");
-
-        return plat;
-}
-#else
-static inline const struct stmpe_keypad_platform_data *
-stmpe_keypad_of_probe(struct device *dev)
-{
-        return ERR_PTR(-EINVAL);
-}
-#endif
-
 static int stmpe_keypad_probe(struct platform_device *pdev)
 {
         struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
-        const struct stmpe_keypad_platform_data *plat;
+        struct device_node *np = pdev->dev.of_node;
         struct stmpe_keypad *keypad;
         struct input_dev *input;
+        u32 rows;
+        u32 cols;
         int error;
         int irq;
 
-        plat = stmpe->pdata->keypad;
-        if (!plat) {
-                plat = stmpe_keypad_of_probe(&pdev->dev);
-                if (IS_ERR(plat))
-                        return PTR_ERR(plat);
-        }
-
         irq = platform_get_irq(pdev, 0);
         if (irq < 0)
                 return irq;
@@ -326,6 +306,13 @@ static int stmpe_keypad_probe(struct platform_device *pdev)
         if (!keypad)
                 return -ENOMEM;
 
+        keypad->stmpe = stmpe;
+        keypad->variant = &stmpe_keypad_variants[stmpe->partnum];
+
+        of_property_read_u32(np, "debounce-interval", &keypad->debounce_ms);
+        of_property_read_u32(np, "st,scan-count", &keypad->scan_count);
+        keypad->no_autorepeat = of_property_read_bool(np, "st,no-autorepeat");
+
         input = devm_input_allocate_device(&pdev->dev);
         if (!input)
                 return -ENOMEM;
@@ -334,23 +321,22 @@ static int stmpe_keypad_probe(struct platform_device *pdev)
         input->id.bustype = BUS_I2C;
         input->dev.parent = &pdev->dev;
 
-        error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
-                                           STMPE_KEYPAD_MAX_ROWS,
-                                           STMPE_KEYPAD_MAX_COLS,
+        error = matrix_keypad_parse_of_params(&pdev->dev, &rows, &cols);
+        if (error)
+                return error;
+
+        error = matrix_keypad_build_keymap(NULL, NULL, rows, cols,
                                            keypad->keymap, input);
         if (error)
                 return error;
 
         input_set_capability(input, EV_MSC, MSC_SCAN);
-        if (!plat->no_autorepeat)
+        if (!keypad->no_autorepeat)
                 __set_bit(EV_REP, input->evbit);
 
-        stmpe_keypad_fill_used_pins(keypad);
+        stmpe_keypad_fill_used_pins(keypad, rows, cols);
 
-        keypad->stmpe = stmpe;
-        keypad->plat = plat;
         keypad->input = input;
-        keypad->variant = &stmpe_keypad_variants[stmpe->partnum];
 
         error = stmpe_keypad_chip_init(keypad);
         if (error < 0)
diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
index cc0deb72e46b..f742b6717d52 100644
--- a/include/linux/mfd/stmpe.h
+++ b/include/linux/mfd/stmpe.h
@@ -115,24 +115,6 @@ extern int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins,
 extern int stmpe_enable(struct stmpe *stmpe, unsigned int blocks);
 extern int stmpe_disable(struct stmpe *stmpe, unsigned int blocks);
 
-struct matrix_keymap_data;
-
-/**
- * struct stmpe_keypad_platform_data - STMPE keypad platform data
- * @keymap_data: key map table and size
- * @debounce_ms: debounce interval, in ms.  Maximum is
- *               %STMPE_KEYPAD_MAX_DEBOUNCE.
- * @scan_count: number of key scanning cycles to confirm key data.
- *              Maximum is %STMPE_KEYPAD_MAX_SCAN_COUNT.
- * @no_autorepeat: disable key autorepeat
- */
-struct stmpe_keypad_platform_data {
-        const struct matrix_keymap_data *keymap_data;
-        unsigned int debounce_ms;
-        unsigned int scan_count;
-        bool no_autorepeat;
-};
-
 #define STMPE_GPIO_NOREQ_811_TOUCH      (0xf0)
 
 /**
@@ -201,7 +183,6 @@ struct stmpe_ts_platform_data {
  * @irq_gpio: gpio number over which irq will be requested (significant only if
  *            irq_over_gpio is true)
  * @gpio: GPIO-specific platform data
- * @keypad: keypad-specific platform data
  * @ts: touchscreen-specific platform data
  */
 struct stmpe_platform_data {
@@ -214,7 +195,6 @@ struct stmpe_platform_data {
         int autosleep_timeout;
 
         struct stmpe_gpio_platform_data *gpio;
-        struct stmpe_keypad_platform_data *keypad;
         struct stmpe_ts_platform_data *ts;
 };